10 AKT. 15. — M. OGAWA : PRELIMINAKY 



gives a yellowish brown precipitate with potassium Chromate. 

 Potassium iodide gives no precipitate. 



6. On fusing the oxide with sodium carbonate and potas- 

 sium nitrate, a green mass is obtained, soluble in water. This 

 solution gives a brown precipitate on passing a current of 

 carbonic acid gas, the precipitate readily dissolving in dilute 

 hydrochloric acid. 



7. After fusion in the above manner, neither ammonia nor 

 ammonium sulphide gives any precipitate ; but on acidifying the 

 solution, to which ammonium sulphide has been added, with 

 hydrochloric acid a brown precipitate is formed. 



8. After the reduction of the above solution with zinc and 

 hydrochloric acid, ammonia in the presence of an excess of 

 ammonium chloride again precipitates the hydroxide. 



9. When the oxide is heated in a current of chlorine gas 

 saturated with the vapour of carbon tetrachloride, a difficultly 

 volatile anhydrous chloride is obtained, -which dissolves in water 

 to form a pale green solution. 



10. The chloride gives a characteristic line, besides two 

 other feebler lines, in the green-blue part of the spectrum, having 

 a wave-length of 4882. 



11. The equivalent weight of the element is about 50, this 

 element probably filling the gap between molybdenum and ruthe- 

 nium and having an atomic weight of about 100. 



1 2. The element appears to exist in two degrees of oxidation. 

 The lower oxide behaves as a basic oxide and comes along with 

 alumina in the ordinary course of analysis. Its separation from 

 the latter is, indeed, very difficult, the conversion into the 

 difficultly volatile chloride by heating in a current of chlorine 

 gas and carbon tetrachloride vapour being, at present, the only 



